9

Orientation Constraint 409
Upnode Control g rou p :
Lets you quickly flip between LookAt Upnode
Cont rol and Axis Alignment.
Look At—WhenselectedtheUpnodematchesthe
LookAt target.
Axis Alignment—When this is selected the Upnode
Aligns to the object axis. Choose which axis (X,
YorZ)intheSourceUpnodeAlignmentgroup
directly below Upnode Control.
Source/Upnode Alignment group
Sour ce Axis—Chooses the constrained object’s
axis that is to be aligned to the Upnode Axis. The
Source Axis reflects the constrained object’s Local
Axis. The Source Axis and LookAt Axis work
together therefore the Axis used to define the
LookAt Axis w i ll b e unavailable.
Aligned to Upnode Axis—Chooses the Upnode axis
that the selected Source Axis aligns to. Note that
the selected Source axis may or may not be able to
completely align to the Upnode Axis.
Orientation Constraint
Animation menu > Constraints > Orientation Constraint
Orientation constraints align the awning vanes to the
supporting rod.
An Orientation constraint causes an object’s
orientation to follow the orientation of an object
or averaged orientation of several objects.
An Orientation Constrained object can be any
rotatable object. When constrained it will inherit
its rotation from a target object. Once constrained
you can not rotate the object manually. You
maymoveorscaletheobjectaslongasitsnot
constrained in a manner that effects the object’s
position or scale controller.
The target object can b e any typ e of object. The
rotation of a target object drives the constrained
object. Targets can be animated using any of the
standard translation, rotation, and scale tools.
Multiple Ta rgets and Weighting
A constrained object can be influenced by several
target objects. When u sing multiple t argets, each
target has a weight value that defines the degree by
which it influences the constrained object, relative
to other targets.
UsingWeightismeaningful(andavailable)only
w ith multiple targets. A va lue of 0 means the
target has no influence. Any value greater than
0 causes the target to influence the constrained
object relative to other t argets’ Weight sett ings.
For example, a target with a Weight va lue of 80 will
have twice the influence of a target with a Weight
value of 40.
Procedures
To assign an Orientation constraint:
1.
Select the object you want to constrain.
2. Choose Animation menu > Constraints >
Orientation Constraint.
3. Select target object.
To a ccess the Orientation constra int’ s para meters
through the Motion panel:
1.
Select the Orientation-constrained object.